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(* Check integer conversion. *)
fun verifyBase radix n =
valOf(StringCvt.scanString (Int.scan radix)(Int.fmt radix n)) = n
fun verify n =
if verifyBase StringCvt.DEC n andalso verifyBase StringCvt.HEX n andalso
verifyBase StringCvt.OCT n andalso verifyBase StringCvt.BIN n
then () else raise Fail "failed";
(* Random number generator. From Isabelle. *)
local
fun rmod x y = x - y * Real.realFloor (x / y);
val a = 16807.0;
val m = 2147483647.0;
val random_seed = ref 1.0;
in
fun random () =
let
val r = rmod (a * ! random_seed) m
in
random_seed := r;
Real.floor r
end
end;
fun doFor f 0 = () | doFor f n = (f(); doFor f (n-1));
verify 0;
verify 1;
verify ~1;
verify 100000000000000000000000;
verify 100000000000000000000001;
verify 9051234567;
doFor(fn () => (verify(random()); verify(~(random())))) 100;
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